[mips] Account for endianess when expanding BuildPairF64/ExtractElementF64 nodes.

Summary:
In order to support big endian targets for the BuildPairF64 nodes we
just need to swap the low/high pair registers. Additionally, for the
ExtractElementF64 nodes we have to calculate the correct stack offset
with respect to the node's register/operand that we want to extract.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5753

llvm-svn: 219931

2 files changed, 35 insertions, 68 deletions

diff --git a/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp b/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp
index 67f96d16fd0..97d9edfe6a5 100644
--- a/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp
@@ -325,6 +325,8 @@ bool ExpandPseudo::expandBuildPairF64(MachineBasicBlock &MBB,
     // We re-use the same spill slot each time so that the stack frame doesn't
     // grow too much in functions with a large number of moves.
     int FI = MF.getInfo<MipsFunctionInfo>()->getMoveF64ViaSpillFI(RC2);
+    if (!Subtarget.isLittle())
+      std::swap(LoReg, HiReg);
     TII.storeRegToStack(MBB, I, LoReg, I->getOperand(1).isKill(), FI, RC, &TRI,
                         0);
     TII.storeRegToStack(MBB, I, HiReg, I->getOperand(2).isKill(), FI, RC, &TRI,
@@ -369,6 +371,7 @@ bool ExpandPseudo::expandExtractElementF64(MachineBasicBlock &MBB,
     unsigned DstReg = I->getOperand(0).getReg();
     unsigned SrcReg = I->getOperand(1).getReg();
     unsigned N = I->getOperand(2).getImm();
+    int64_t Offset = 4 * (Subtarget.isLittle() ? N : (1 - N));
 
     // It should be impossible to have FGR64 on MIPS-II or MIPS32r1 (which are
     // the cases where mfhc1 is not available). 64-bit architectures and
@@ -385,7 +388,7 @@ bool ExpandPseudo::expandExtractElementF64(MachineBasicBlock &MBB,
     int FI = MF.getInfo<MipsFunctionInfo>()->getMoveF64ViaSpillFI(RC);
     TII.storeRegToStack(MBB, I, SrcReg, I->getOperand(1).isKill(), FI, RC, &TRI,
                         0);
-    TII.loadRegFromStack(MBB, I, DstReg, FI, RC2, &TRI, N * 4);
+    TII.loadRegFromStack(MBB, I, DstReg, FI, RC2, &TRI, Offset);
     return true;
   }
 
diff --git a/llvm/test/CodeGen/Mips/fp64a.ll b/llvm/test/CodeGen/Mips/fp64a.ll
index 5c2c87373a3..fadce5cb748 100644
--- a/llvm/test/CodeGen/Mips/fp64a.ll
+++ b/llvm/test/CodeGen/Mips/fp64a.ll
@@ -12,9 +12,9 @@
 ;        this check here.
 
 ; RUN: llc -march=mips -mcpu=mips32r2 -mattr=fp64 < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-NO-FP64A-BE
-; RUN: llc -march=mips -mcpu=mips32r2 -mattr=fp64,nooddspreg < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-FP64A-BE
+; RUN: llc -march=mips -mcpu=mips32r2 -mattr=fp64,nooddspreg < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-FP64A
 ; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=fp64 < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-NO-FP64A-LE
-; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=fp64,nooddspreg < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-FP64A-LE
+; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=fp64,nooddspreg < %s | FileCheck %s -check-prefix=ALL -check-prefix=32R2-FP64A
 
 ; RUN: llc -march=mips64 -mcpu=mips64 -mattr=fp64 < %s | FileCheck %s -check-prefix=ALL -check-prefix=64-NO-FP64A
 ; RUN: not llc -march=mips64 -mcpu=mips64 -mattr=fp64,nooddspreg < %s 2>&1 | FileCheck %s -check-prefix=64-FP64A
@@ -38,15 +38,10 @@ define double @call1(double %d, ...) {
 ; 32R2-NO-FP64A-BE:         mtc1    $5, $f0
 ; 32R2-NO-FP64A-BE:         mthc1   $4, $f0
 
-; 32R2-FP64A-LE:            addiu   $sp, $sp, -8
-; 32R2-FP64A-LE:            sw      $4, 0($sp)
-; 32R2-FP64A-LE:            sw      $5, 4($sp)
-; 32R2-FP64A-LE:            ldc1    $f0, 0($sp)
-
-; 32R2-FP64A-BE:            addiu   $sp, $sp, -8
-; 32R2-FP64A-BE:            sw      $5, 0($sp)
-; 32R2-FP64A-BE:            sw      $4, 4($sp)
-; 32R2-FP64A-BE:            ldc1    $f0, 0($sp)
+; 32R2-FP64A:               addiu   $sp, $sp, -8
+; 32R2-FP64A:               sw      $4, 0($sp)
+; 32R2-FP64A:               sw      $5, 4($sp)
+; 32R2-FP64A:               ldc1    $f0, 0($sp)
 
 ; 64-NO-FP64A:              daddiu  $sp, $sp, -64
 ; 64-NO-FP64A:              mov.d   $f0, $f12
@@ -63,15 +58,10 @@ define double @call2(i32 %i, double %d) {
 ; 32R2-NO-FP64A-BE:     mtc1    $7, $f0
 ; 32R2-NO-FP64A-BE:     mthc1   $6, $f0
 
-; 32R2-FP64A-LE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-LE:        sw      $6, 0($sp)
-; 32R2-FP64A-LE:        sw      $7, 4($sp)
-; 32R2-FP64A-LE:        ldc1    $f0, 0($sp)
-
-; 32R2-FP64A-BE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-BE:        sw      $7, 0($sp)
-; 32R2-FP64A-BE:        sw      $6, 4($sp)
-; 32R2-FP64A-BE:        ldc1    $f0, 0($sp)
+; 32R2-FP64A:           addiu   $sp, $sp, -8
+; 32R2-FP64A:           sw      $6, 0($sp)
+; 32R2-FP64A:           sw      $7, 4($sp)
+; 32R2-FP64A:           ldc1    $f0, 0($sp)
 
 ; 64-NO-FP64A-NOT:      daddiu  $sp, $sp
 ; 64-NO-FP64A:          mov.d   $f0, $f13
@@ -88,15 +78,10 @@ define double @call3(float %f1, float %f2, double %d) {
 ; 32R2-NO-FP64A-BE:     mtc1    $7, $f0
 ; 32R2-NO-FP64A-BE:     mthc1   $6, $f0
 
-; 32R2-FP64A-LE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-LE:        sw      $6, 0($sp)
-; 32R2-FP64A-LE:        sw      $7, 4($sp)
-; 32R2-FP64A-LE:        ldc1    $f0, 0($sp)
-
-; 32R2-FP64A-BE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-BE:        sw      $7, 0($sp)
-; 32R2-FP64A-BE:        sw      $6, 4($sp)
-; 32R2-FP64A-BE:        ldc1    $f0, 0($sp)
+; 32R2-FP64A:           addiu   $sp, $sp, -8
+; 32R2-FP64A:           sw      $6, 0($sp)
+; 32R2-FP64A:           sw      $7, 4($sp)
+; 32R2-FP64A:           ldc1    $f0, 0($sp)
 
 ; 64-NO-FP64A-NOT:      daddiu  $sp, $sp
 ; 64-NO-FP64A:          mov.d   $f0, $f14
@@ -113,15 +98,10 @@ define double @call4(float %f, double %d, ...) {
 ; 32R2-NO-FP64A-BE:     mtc1    $7, $f0
 ; 32R2-NO-FP64A-BE:     mthc1   $6, $f0
 
-; 32R2-FP64A-LE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-LE:        sw      $6, 0($sp)
-; 32R2-FP64A-LE:        sw      $7, 4($sp)
-; 32R2-FP64A-LE:        ldc1    $f0, 0($sp)
-
-; 32R2-FP64A-BE:        addiu   $sp, $sp, -8
-; 32R2-FP64A-BE:        sw      $7, 0($sp)
-; 32R2-FP64A-BE:        sw      $6, 4($sp)
-; 32R2-FP64A-BE:        ldc1    $f0, 0($sp)
+; 32R2-FP64A:           addiu   $sp, $sp, -8
+; 32R2-FP64A:           sw      $6, 0($sp)
+; 32R2-FP64A:           sw      $7, 4($sp)
+; 32R2-FP64A:           ldc1    $f0, 0($sp)
 
 ; 64-NO-FP64A:          daddiu  $sp, $sp, -48
 ; 64-NO-FP64A:          mov.d   $f0, $f13
@@ -145,23 +125,14 @@ define double @call5(double %a, double %b, ...) {
 ; 32R2-NO-FP64A-BE-DAG:     mthc1   $6, $[[T1:f[0-9]+]]
 ; 32R2-NO-FP64A-BE:         sub.d   $f0, $[[T0]], $[[T1]]
 
-; 32R2-FP64A-LE:            addiu   $sp, $sp, -8
-; 32R2-FP64A-LE:            sw      $6, 0($sp)
-; 32R2-FP64A-LE:            sw      $7, 4($sp)
-; 32R2-FP64A-LE:            ldc1    $[[T1:f[0-9]+]], 0($sp)
-; 32R2-FP64A-LE:            sw      $4, 0($sp)
-; 32R2-FP64A-LE:            sw      $5, 4($sp)
-; 32R2-FP64A-LE:            ldc1    $[[T0:f[0-9]+]], 0($sp)
-; 32R2-FP64A-LE:            sub.d   $f0, $[[T0]], $[[T1]]
-
-; 32R2-FP64A-BE:            addiu   $sp, $sp, -8
-; 32R2-FP64A-BE:            sw      $7, 0($sp)
-; 32R2-FP64A-BE:            sw      $6, 4($sp)
-; 32R2-FP64A-BE:            ldc1    $[[T1:f[0-9]+]], 0($sp)
-; 32R2-FP64A-BE:            sw      $5, 0($sp)
-; 32R2-FP64A-BE:            sw      $4, 4($sp)
-; 32R2-FP64A-BE:            ldc1    $[[T0:f[0-9]+]], 0($sp)
-; 32R2-FP64A-BE:            sub.d   $f0, $[[T0]], $[[T1]]
+; 32R2-FP64A:               addiu   $sp, $sp, -8
+; 32R2-FP64A:               sw      $6, 0($sp)
+; 32R2-FP64A:               sw      $7, 4($sp)
+; 32R2-FP64A:               ldc1    $[[T1:f[0-9]+]], 0($sp)
+; 32R2-FP64A:               sw      $4, 0($sp)
+; 32R2-FP64A:               sw      $5, 4($sp)
+; 32R2-FP64A:               ldc1    $[[T0:f[0-9]+]], 0($sp)
+; 32R2-FP64A:               sub.d   $f0, $[[T0]], $[[T1]]
 
 ; 64-NO-FP64A:              sub.d   $f0, $f12, $f13
 }
@@ -179,19 +150,12 @@ define double @move_from(double %d) {
 ; 32R2-NO-FP64A-BE-DAG: mfc1    $7, $f0
 ; 32R2-NO-FP64A-BE-DAG: mfhc1   $6, $f0
 
-; 32R2-FP64A-LE:        addiu   $sp, $sp, -32
-; 32R2-FP64A-LE:        sdc1    $f0, 16($sp)
-; 32R2-FP64A-LE:        lw      $6, 16($sp)
-; FIXME: This store is redundant
-; 32R2-FP64A-LE:        sdc1    $f0, 16($sp)
-; 32R2-FP64A-LE:        lw      $7, 20($sp)
-
-; 32R2-FP64A-BE:        addiu   $sp, $sp, -32
-; 32R2-FP64A-BE:        sdc1    $f0, 16($sp)
-; 32R2-FP64A-BE:        lw      $6, 20($sp)
+; 32R2-FP64A:           addiu   $sp, $sp, -32
+; 32R2-FP64A:           sdc1    $f0, 16($sp)
+; 32R2-FP64A:           lw      $6, 16($sp)
 ; FIXME: This store is redundant
-; 32R2-FP64A-BE:        sdc1    $f0, 16($sp)
-; 32R2-FP64A-BE:        lw      $7, 16($sp)
+; 32R2-FP64A:           sdc1    $f0, 16($sp)
+; 32R2-FP64A:           lw      $7, 20($sp)
 
 ; 64-NO-FP64A:          mov.d   $f13, $f0
 }